Bug 104986 Backgound image uses an absolute path
Currently Chart uses an absolute path to indicate a backgournd image, that may cause the design unusable on other environments. Expected the background image can be definded in multiple ways like in report designer. e.g. URI(absolute path), File(relative path), Embedded Image(Encoded Image Data).
chart/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/MarkerIconDialog.java
for ( int i = 0; i < controls.length; i++ )
		{
			controls[i].dispose( );
		}
		
		
		switch ( type )
		{
			case URI_TYPE :
				swtichToURIType( );
				break;
			case LOCAL_TYPE :
				swtichToListType( );
				break;
		}
		inputArea.layout( );
	}
	private void swtichToURIType( )
	{
		Label title = new Label( inputArea, SWT.NONE );
		title.setLayoutData( new GridData( GridData.VERTICAL_ALIGN_BEGINNING ) );
		title.setText( Messages.getString( "MarkerIconDialog.Lbl.EnterURL" ) ); 
		uriEditor = new Text( inputArea, SWT.SINGLE | SWT.BORDER );
		uriEditor.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		uriEditor.addModifyListener( this );
		Composite innerComp = new Composite( inputArea, SWT.NONE );
		innerComp.setLayoutData( new GridData( GridData.HORIZONTAL_ALIGN_END ) );
		GridLayout gl = new GridLayout( 2, false );
		gl.marginWidth = 0;
		gl.marginHeight = 0;