I need urgent help!

Hi!!!
well in my SDI project, there is a modeless dialog window and in that window some values are received from a driver and displayed in label boxes..There is also a graph drawn in SDI window, basing on those figures. What I want to do is to display the SDI window and the modeless dialog at the same time so dynamically presenting the values in the modeless dialog and the graph will be available at the same time..In order to grab the values in each second, I createad a timer and wrote the necessary code for grabbing the values from the driver in the timer event, and to display the SDI view I added an Invalidate function in the timer event also, but nothing happened...
I am looking forward to your ideas and solutions..
Thanks in advance...