DisposeControl
DisposeControl Remove control from screen and free its memory
#include <Controls.h> Control Manager
void DisposeControl(theControl );
ControlHandle theControl ; handle of control to dispose
DisposeControl erases a control from the screen, releases memory
occupied by a ControlRecord structure, and removes the control from the
owning window's control list.
theControl is a handle leading to a variable length ControlRecord. It is a value
obtained from NewControl or GetNewControl.
Returns: none

Notes: ControlRecords and ControlHandles are automatically disposed when their
owning window is disposed (see DisposeWindow).
The KillControls function disposes of all of a window's controls by
making multiple calls to this function.
If a control has an associated color table. it will be deleted unless it is a
resource. Also if the control has an associated non-default AuxRec, it will
be removed from memory as well.