Selected modulename not showing up (as highlight)

Hello,

I have something strange. I have made a custom module called Eguide and I have added a tab in the Control Panel to access it easily. Now what I would expect to happen is that if I’m using the Eguide module, that this new tab will also be selected/highlighted (as long as M=Eguide, I would think). But I’m thinking wrong, because the Eguide tab is usually not selected. It is selected at some moments, but most of the time, the modules tab just shows up as being the selected/highlighted tab.

Is there a way to always make this Eguide tab stand out?

Thanks! Michiel.