Bug 120218 Right click menu option to apply theme.
We should support the following right click menu. -- User right clicks int he report design layout area. -- The following menu items needs to be supported Theme --> Apply Theme -->Theme1 -->Theme2 ( similar to Apply style menu option )
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/providers/SchematicContextMenuProvider.java
action.setAccelerator( SWT.F2 );
					if ( element instanceof DataEditPart )
					{
						action.setText( Messages.getString( "SchematicContextMenuProvider.ActionText.editData" ) ); 
					}
					else
					{
						action.setText( Messages.getString( "SchematicContextMenuProvider.ActionText.editLabel" ) ); 
					}
					menuManager.appendToGroup( GEFActionConstants.GROUP_EDIT,
							action );
				}
				if ( firstSelectedElement instanceof ReportItemHandle )
				{
					IAction action = getAction( CreatePlaceHolderPartAction.ID );
					menuManager.appendToGroup( GEFActionConstants.GROUP_EDIT,
							action );
					action = getAction( RevertToReportItemPartAction.ID );
					menuManager.appendToGroup( GEFActionConstants.GROUP_EDIT,
							action );
					action = getAction( RevertToTemplatePartAction.ID );
					menuManager.appendToGroup( GEFActionConstants.GROUP_EDIT,
							action );
				}
				if ( firstSelectedElement instanceof TemplateReportItemHandle )
				{
					IAction action = getAction( RevertToReportItemPartAction.ID );
					menuManager.appendToGroup( GEFActionConstants.GROUP_EDIT,
							action );
				}