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
gl.verticalSpacing = 2;
		innerComp.setLayout( gl );
		btnAdd = new Button( innerComp, SWT.PUSH );
		btnAdd.setText( Messages.getString( "MarkerIconDialog.Lbl.Add" ) ); 
		btnAdd.setLayoutData( new GridData( GridData.HORIZONTAL_ALIGN_END ) );
		btnAdd.setEnabled( false );
		btnAdd.addSelectionListener( this ); 
		
		btnPreview = new Button( innerComp, SWT.PUSH );
		btnPreview.setText( Messages.getString( "MarkerIconDialog.Lbl.Preview" ) ); 
		btnPreview.setLayoutData( new GridData( GridData.HORIZONTAL_ALIGN_END ) );
		btnPreview.setEnabled( false );
		btnPreview.addSelectionListener( this );
	}
	private void swtichToListType( )
	{
		Composite buttonBar = new Composite( inputArea, SWT.NONE );
		GridLayout gl = new GridLayout( );
		gl.marginWidth = 0;
		gl.marginHeight = 0;
		buttonBar.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		buttonBar.setLayout( gl );
		Label description = new Label( buttonBar, SWT.NONE );
		description.setLayoutData( new GridData( GridData.HORIZONTAL_ALIGN_BEGINNING ) );
		description.setText( Messages.getString( "MarkerIconDialog.Lbl.Description" ) ); 
		btnBrowse = new Button( buttonBar, SWT.PUSH );
		btnBrowse.setText( Messages.getString( "MarkerIconDialog.Lbl.Browse" ) ); 
		GridData gd = new GridData( GridData.HORIZONTAL_ALIGN_END );
		gd.grabExcessHorizontalSpace = true;
		btnBrowse.setLayoutData( gd );