add:   this.setZIndex( 1e7 ); 
context: qx.Proto._commonMouseDown = function(){  // enable capturing  this._splitter.setCapture( true );  // show the slider also outside of the sash's bounds  this.setOverflow( qx.constant.Style.OVERFLOW_VISIBLE );    // initialize the slider  if( !this.isLiveResize() ) {    this._slider._applyRuntimeLeft( this._splitter.getOffsetLeft() );    this._slider._applyRuntimeTop( this._splitter.getOffsetTop() );    this._slider.setWidth( this._splitter.getBoxWidth() );    this._slider.setHeight( this._splitter.getBoxHeight() );    this._slider.show();  }}
meta: 8114	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8114/87de549a5fb0c2ae5c790b828ed79d5529b743ac/Sash.js/clean/bundles/org.eclipse.rap.rwt/js/org/eclipse/rap/rwt/Sash.js