Getting any toolbar of a window

I met such a problem. I'm writing a View which is planned to be put in a pane of a Splitter. This View has its specific toolbar and this toolbar has to be added to ones are already present in the window.

But if I add the toolbar simply it is positioned to a new row, but I wish to place it maximally compactly. I know what to do if I have a pointer/handle of any already present toolbar. But the problem is to get the pointer/handle.

Or there is another way to place my toolbar well?