A long time ago I added the Identifier tab to the Uses Clause Manager in GExperts. It looks like this:
In this screen shot, I filtered for TWinControl and the expert found several matching entries, the two top ones in the unit Controls.
While this looks like a bug at first (indeed I have received a bug report for it) it is in fact a feature. There are actually two declarations of TWinControl in the unit Controls. The first is in line 212, which is a forward declaration like this:
type TWinControl = class;
The other is in line 1243, which is the actual declaration of the class:
TWinControl = class(TControl) // class declaration goes here end;
The expert lists them both and when the user clicks the “Open Unit” button (or presses Ctrl+O), it will then open that unit and place the cursor in the line of the declaration.
One word to the person who reported that bug: Please do not be offended that I blogged about it not being an actual bug but a feature. It is not meant to shame you. On the contrary, I am grateful that I receive good bug reports like this one. Please keep them coming!