contains
Description:
Checks whether the specified point is within the extent of the this.
Toolkit implementor note: ATK provides a default implementation for this virtual method. In general there are little reason to re-implement it.
Parameters:
| this | the Component | 
| x | x coordinate | 
| y | y coordinate | 
| coord_type | specifies whether the coordinates are relative to the screen or to the components top level window | 
Returns:
| 
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