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},
destruct : function() {
if( this._control != null ) {
this._control.setParent( this.getParent() );
this._control.setDisplay( false );
this._control = null;
}
if( this._handle != null ) {
this._handle.removeEventListener( "mousedown", this._onHandleMouseDown, this );
this._handle.removeEventListener( "mousemove", this._onHandleMouseMove, this );