can't debug labwindows

[gchock]

Debug button is greyed out when I debug a DLL. But the debug button is there when I debug an exe. 

[RobertoBozzolo]

You can't simply debug a dll-target project: you can debug a dll via the process that uses its functions. More informations can be found in Debugging DLLs help topic, which you find within CVI help or here.