Drop Down forces calculate

[demuro1]

I am using a spreadsheet with a user defined function that contains an if and case statements fromthis thread. I am using a combo box to change the dependent cells but need something to automatically calculate the sheet. is there a way I can have a calculation occur every time a selection is made in the combo box or is there a macro that will do it. I'm fairly new to VBA so some direction with the solution would be greatly appreciated

thanks