Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control.
public procedure Invalidate(rc: TRect; invalidateChildren: Boolean); reintroduce; overload;
- Type: TRect
A Rectangle that represents the region to invalida
- Type: Boolean
true to invalidate the control's child controls; otherwise, false.