void __fastcall UpdateDesigner();
Notifies the designer when rows and columns of the grid are moved or resized.
At design time, the designer automatically keeps track of property changes so that it can prompt the user to save any changes. Moving or resizing the rows and columns of the grid using the mouse bypasses this system. When such changes occur, UpdateDesigner notifies the designer that the properties of the grid have changed and that the changes should be saved.