public void ShowUIElementIfTabPressed(NodeAddedEvent e, ShowWhileTabPressedNode uiElement)
 {
     uiElement.visibilityPrerequisites.AddShowPrerequisite(this.TAB_PRESSED_PREREQUISITE, true);
 }
 public void HideUIElementIfTabUnpressed(NodeRemoveEvent e, ShowWhileTabPressedNode showWhileTabPressed)
 {
     showWhileTabPressed.visibilityPrerequisites.RemoveShowPrerequisite(this.TAB_PRESSED_PREREQUISITE, true);
 }