Bug 117149 Add additional datapoint markers
I would like to propose adding additional datapoint markers. Attached is a set of markers I would like supported.
chart/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/MarkerIconDialog.java
* @param composite
	 *            dialog composite
	 */
	private void createPreviewArea( Composite composite )
	{
		Composite previewArea = new Composite( composite, SWT.BORDER );
		GridData gd = new GridData( GridData.FILL_BOTH );
		gd.widthHint = 250;
		gd.heightHint = 260;
		previewArea.setLayoutData( gd );
		previewArea.setLayout( new FillLayout( ) );
		previewCanvas = new IconCanvas( previewArea );
	}
	/**
	 * Switch in the Selection Area (URI or Local).
	 * 
	 * @param type
	 *            0: URI_TYPE; 1: LOCAL_TYPE
	 */
	private void switchTo( int type )
	{
		if ( type == selectedType )
		{
			
			
			return;
		}
		
		selectedType = type;
		Control[] controls = inputArea.getChildren( );