Not so easy because the call of the form is in my action class. Tried the following. //created a property in action class private Form parentForm; public Form ParentForm { get { return parentForm; } set { parentForm = value; } } //in frmMain in clicked event added _clsUsage.ParentForm = this; //in the action class in the action method _frmStatus.Parent = ParentForm; But this creates an ArgumentException.

dj_jeff wrote: but can't make this handling easier. If you are looking for easy work, I suggest you choose a different career. The generally accept view, by uneducated people of software development, that it's easy and anyone can do it, is complete hogwash. It has always been complicated and there are no signs that will change in near future. You might want to watch the video accessible from this web page.[^] led mike

Tried Refresh() and worked :), Invalidate didn't do it :(. Form won't only be displayed correctly in debugging mode. But that's ok. The best way of practise would be if I can do a periodical refresh on the form. But use of form object in Timer section and TimerElapsedEventHandler at the same time produces an error saying refresh can't be done when form is in both sections. If the user switches away and back to the program it seems as if the app has hung up. Because it's waiting for finishing the current process.