public void createPartControl (Composite parent) {
TreeViewer tree = new TreeViewer (parent, SWT.NONE);
tree.setLabelProvider (this);
tree.setContentProvider (this);
tree.getTree ().setHeaderVisible (true);

TreeColumnLayout  mainCompositeTreeColumnLayout = new TreeColumnLayout();
parent .setLayout(mainCompositeTreeColumnLayout);

TreeColumn column = new TreeColumn (tree.getTree (), SWT.NONE);
mainCompositeTreeColumnLayout.setColumnData(column, new ColumnWeightData(40, true));
column.setText ("A");

column = new TreeColumn (tree.getTree (), SWT.NONE);
mainCompositeTreeColumnLayout.setColumnData(column, new ColumnWeightData(40, true));
column.setText ("B");
tree.setInput ("");

updateColumnsWidth : function() {
      var columnWidth = new Array();
      var fullWidth = this.getTree().getParent().getColumnsWidth();
      this.setWidth( fullWidth );
      for( var c = 0; c < this.getTree().getParent()._columns.length; c++ ) {
        columnWidth[ c ] = this.getTree().getParent()._columns[ c ].getWidth();
      }
      
      if( columnWidth.length > 0 ) {
    	var iconObj = this.getIconObject();
    	var iconWidth = this._images[ 0 ] == null ? 0 : this.getIconObject().getWidth();
    	var checkBoxWidth = this._checkBox == null ? 0 : 16; // 13 width + 3 checkbox margin 
    	var spacing = iconWidth > 0 ? iconObj.getMarginRight() : 0;
    	var labelObj = this.getLabelObject();
    	
        labelObj.setWidth( columnWidth[ 0 ]
          - ( this.getLevel() * 19 )   // TODO: [bm] replace with computed indent width
          - checkBoxWidth
          - iconWidth
          - spacing );
        
        if (iconWidth == 0 && checkBoxWidth == 0) {
	        var indentObj = this.getIndentObject();
	        var indentObjWidth = indentObj.getWidth();
			var firstCell = indentObj.getWidth()+checkBoxWidth+iconWidth+spacing;
			if (firstCell > columnWidth[0]) {
			  indentObj.setClipWidth(columnWidth[0]);
			  indentObj.setWidth(columnWidth[0]);
			  iconObj.setVisibility(false);
			}
			else {
			  indentObj.setClipWidth(columnWidth[0]);
			  iconObj.setVisibility(true);
			  this._updateIndent();
			}
        }
        
        var coLabel;
        for( var i = 1; i < columnWidth.length; i++ ) {
          coLabel = this._colLabels[ i - 1 ];
          iconWidth = this._images[ i ] == null ? 0 : 16;
          spacing = iconWidth > 0 ? coLabel.getSpacing() : 0;          
          if( coLabel != null && coLabel.getLabelObject() != null ) {
            coLabel.getLabelObject().setWidth( columnWidth[ i ] 
              - iconWidth 
              - spacing );
          }
        }
      }
    },
    

    flushTree : function() {
    	this.base(arguments);
        this.updateColumnsWidth();
    }