Utility class for making new GUI controls.
Unless you are creating your own GUI controls from scratch, you should not use these functions.
| hasModalWindow | A global property, which is true if a ModalWindow is being displayed, false otherwise. |
| hotControl | The controlID of the current hot control. |
| keyboardControl | The controlID of the control that has keyboard focus. |
| systemCopyBuffer | Get access to the system-wide pasteboard. |
| GetControlID | Get a unique ID for a control. |
| GetStateObject | Get a state object from a controlID. |
| GUIToScreenPoint | Convert a point from GUI position to screen space. |
| QueryStateObject | Get an existing state object from a controlID. |
| RotateAroundPivot | Helper function to rotate the GUI around a point. |
| ScaleAroundPivot | Helper function to scale the GUI around a point. |
| ScreenToGUIPoint | Convert a point from screen space to GUI position. |