private void ListFilesUsingColor()
        {
            enhmb = new EnhancedMessageBox();
            enhmb.StartPosition = FormStartPosition.Manual;
            enhmb.Location      = new Point(this.Location.X, this.Location.Y);
            enhmb.SetText("Processing files.\nThis may take a few seconds.");
            enhmb.SetCaption("Processing files.");
            enhmb.ProgressBarVisible(true);
            enhmb.button_OK_text("Abort");
            enhmb.Show();

            Cursor.Current = Cursors.WaitCursor;
            Application.DoEvents(); //finish showing the dialog before starting the cpu-intensive operation

            int filescount = this.listView_MainFileList.SelectedItems.Count;

            enhmb.ProgressBarSize(filescount);
            int pb = 0;

            foreach (ListViewItem item in this.listView_MainFileList.SelectedItems)
            {
                pb++;
                enhmb.SetText("Processing files.\nThis may take a few seconds.\n\nFile: " + item.Text);
                enhmb.ProgressBarValue((int)pb);
                Application.DoEvents();
                //accept user input and when the messagebox is closed, stop working
                if (enhmb.Visible == false)
                {
                    break;
                }

                item.Selected = CSHaPer.IsColorUsed(item.Tag.ToString(), (byte)this.uC_EditorPalette1.PaletteSelectedColor);
            }//foreach file
            enhmb.Close();
            Application.DoEvents(); //finish showing the dialog before starting the cpu-intensive operation
            Cursor.Current = Cursors.Default;
            //create result file
            string result = "";

            result  = "Files using color result\r\n";
            result += this.listView_MainFileList.SelectedItems.Count.ToString() + " Files found, using the color [" + this.uC_EditorPalette1.PaletteSelectedColor.ToString() + "]\r\n\r\n";
            for (int i = 0; i < this.listView_MainFileList.SelectedItems.Count; i++)
            {
                result += this.listView_MainFileList.SelectedItems[i].Text + "\r\n";
            }
            System.IO.File.WriteAllText(defaultPath + "#ColorUsage.txt", result);
            System.Diagnostics.Process.Start(defaultPath + "#ColorUsage.txt");
        }