/// <summary>
        /// Lets the game respond to player input. Unlike the Update method,
        /// this will only be called when the gameplay screen is active.
        /// </summary>
        public override void HandleInput(vxInputManager input)
        {
            if (input == null)
            {
                throw new ArgumentNullException("input");
            }

            // Look up inputs for the active player profile.
            int playerIndex = (int)ControllingPlayer.Value;

            KeyboardState keyboardState = input.KeyboardState; // input.CurrentKeyboardStates[playerIndex];
            GamePadState  gamePadState  = input.GamePadState;  // input.CurrentGamePadStates[playerIndex];

            // The game pauses either if the user presses the pause button, or if
            // they unplug the active gamepad. This requires us to keep track of
            // whether a gamepad was ever plugged in, because we don't want to pause
            // on PC if they are playing with a keyboard and have no gamepad at all!
            bool gamePadDisconnected = !gamePadState.IsConnected;

            /*            bool gamePadDisconnected = !gamePadState.IsConnected &&
             *                         input.GamePadWasConnected[playerIndex];*/

            //if (input.IsPauseGame() || gamePadDisconnected)
            if (input.IsPauseGame())
            {
                ShowPauseScreen();
            }
            else
            {
                HandleInputBase(input);
            }
        }
        /// <summary>
        /// Lets the game respond to player input. Unlike the Update method,
        /// this will only be called when the gameplay screen is active.
        /// </summary>
        public override void HandleInput(vxInputManager input)
        {
            if (input == null)
            {
                throw new ArgumentNullException("input");
            }

            // Look up inputs for the active player profile.
            int playerIndex = (int)ControllingPlayer.Value;

            KeyboardState keyboardState = input.KeyboardState; // input.CurrentKeyboardStates[playerIndex];
            GamePadState  gamePadState  = input.GamePadState;  // input.CurrentGamePadStates[playerIndex];

            // The game pauses either if the user presses the pause button, or if
            // they unplug the active gamepad. This requires us to keep track of
            // whether a gamepad was ever plugged in, because we don't want to pause
            // on PC if they are playing with a keyboard and have no gamepad at all!
            bool gamePadDisconnected = !gamePadState.IsConnected;

            /*            bool gamePadDisconnected = !gamePadState.IsConnected &&
             *                         input.GamePadWasConnected[playerIndex];*/
            //if (input.IsPauseGame() || gamePadDisconnected)
            if (input.IsPauseGame())
            {
                if (SandboxStartGameType != vxEnumSandboxGameType.RunGame &&
                    SandboxGameState == vxEnumSandboxGameState.Running)
                {
                    SimulationStop();
                }
                else
                {
                    ShowPauseScreen();
                }
            }
            else if (Camera.CameraType == CameraType.Freeroam)
            {
                //Update If In Edit Mode
                if (SandboxGameState == vxEnumSandboxGameState.EditMode)
                {
                    //Set the Working Plane Height
                    /****************************************************************************************/
                    if (GUIManager.DoesGuiHaveFocus == false &&
                        vxEngine.InputManager.MouseState.MiddleButton == ButtonState.Released)
                    {
                        if (vxEngine.InputManager.ScrollWheelDelta > 0)
                        {
                            WrkngPln_HeightDelta += 0.5f;
                        }
                        else if (vxEngine.InputManager.ScrollWheelDelta < 0)
                        {
                            WrkngPln_HeightDelta -= 0.5f;
                        }

                        workingPlane.Position = Vector3.Up * WrkngPln_HeightDelta;
                    }
                }

                /**********************************************************/
                /*                  Left Button Press                     */
                /**********************************************************/
                if (vxEngine.InputManager.IsNewMouseButtonPress(MouseButtons.LeftButton))
                {
                    //Only do this if the GUI Manager isn't being used
                    if (GUIManager.DoesGuiHaveFocus == false && Cursor.IsMouseHovering == false)
                    {
                        //If it's in 'AddItem' Mode, then Add the Current Key Item
                        if (MouseClickState == vxEnumSanboxMouseClickState.AddItem)
                        {
                            //Set the Location of the current temp_part being added.
                            if (temp_part != null)
                            {
                                AddSandboxItem(CurrentlySelectedKey, temp_part.World);
                            }
                        }

                        else if (MouseClickState == vxEnumSanboxMouseClickState.SelectItem)
                        {
                            //Clear Addative Selection
                            if (vxEngine.InputManager.KeyboardState.IsKeyDown(Keys.LeftShift) == false &&
                                Cursor.SelectionState != vxEnumSelectionState.Hover)
                            {
                                for (int ind = 0; ind < SelectedItems.Count; ind++)
                                {
                                    SelectedItems[ind].SelectionState = vxEnumSelectionState.Unseleced;
                                }
                                SelectedItems.Clear();
                                SetElementIndicies();
                            }

                            if (Index > 0 && Index < Items.Count)
                            {
                                if (SelectedItems.Contains(Items[Index]) == false)
                                {
                                    SelectedItems.Add(Items[Index]);

                                    Items[Index].SelectionState = vxEnumSelectionState.Selected;
                                    Items[Index].GetProperties(PropertiesControl);

                                    // Raise the 'Changed' event.
                                    if (ItemSelected != null)
                                    {
                                        ItemSelected(this, new EventArgs());
                                    }
                                }
                                else
                                {
                                    Items[Index].SelectionState = vxEnumSelectionState.Hover;
                                    SelectedItems.Remove(Items[Index]);
                                }
                            }
                        }
                    }
                }

                /**********************************************************/
                /*                Right Button Press                      */
                /**********************************************************/
                if (vxEngine.InputManager.IsNewMouseButtonPress(MouseButtons.RightButton))
                {
                    RightClick();
                }

                /**********************************************************/
                /*                  Process Keys                          */
                /**********************************************************/

                //Delete Selected Items
                if (vxEngine.InputManager.IsNewKeyPress(Keys.Delete))
                {
                    foreach (vxSandboxEntity sandboxEntity in SelectedItems)
                    {
                        sandboxEntity.DisposeEntity();
                    }

                    SelectedItems.Clear();

                    SetElementIndicies();
                }
            }

            HandleInputBase(input);
        }