When a user double clicks on cell F6 one of two things can happen based upon
whether or not the text in cell C5 contains the string "MDF":

1) If "MDF" is found within C5, a check mark is placed in the cell. I
already have code set up to place a Marlette check box in several different
cells including this one.

2) If "MDF" is not found within C5, an error message pops up and states",
This option is not availabe for (actual contents of C5). Please change the
doorstyle to MDF Painted to proceed.

Would someone please help me write this code?

Thanks,

Kevin