Returns a control bar contained in the mini-frame if the given point is inside this control bar. 
- Returns
 - A pointer to a control bar or NULL.
 
This function is used to obtain a pointer to a control bar containing the given point (in screen coordinates). 
- Parameters
 - 
  
    | point | The point in screen coordinates. | 
    | nSencitivity | The window rectangle of a control bar is inflated according to this value and a control bar may satisfy the search criteria even if the given point is not contained in a control bar | 
    | bCheckVisibility | If TRUE, the function returns only visible control bars. |