Check to see that the user has the data tab active in the TabChanged event and typecast the Designer.Menu.Items property as a Data menu object to access the menu items.
Download: HideDataMenuItems.zip
Sample Delphi code:
procedure TForm1.ppDesigner1TabChanged(Sender: TObject);
var
lSubMenu: TppTBCustomItem;
lDataFileMenu: TdaDataFileMenu;
begin
if (ppDesigner1.Notebook.ActivePageIndex = 0) then
begin
// this can be used to get at any menu times
lSubMenu := ppDesigner1.Menu.Items[0]; // get file menu
ShowMessage(lSubMenu.Items[0].Caption);
// For the Data | File menu we can typecast as TdaDataFileMenu
// The TdaDataFileMenu class has properties that correspond to the items,
// see RBuilder\Source\daDataManager for the class declaration
if (lSubMenu is TdaDataFileMenu) then
begin
lDataFileMenu := TdaDataFileMenu(lSubMenu);
lDataFileMenu.Export.Visible := False; // hide Export menu item
end;
end;
end;