Two questions regarding screen and display update

[Leledumbo]

• How can I get the Width and Height of the screen? Using Screen.Width and Screen.Height (assigned for TForm.Width and TForm.Height respectively at OnCreate) I don't seem to get the correct value as can be seen in the screenshot.
• I do my first drawing in a menu item click event, in the end calling Repaint/Invalidate, but the change is not visible immediately. With or without Repaint/Invalidate, I have to click on the form to make the change visible. How can I force this from code?