ctd when selecting DC3 Ovrhead Elect Panel

Since purchasing the MAAM R4D DC3 for FSX version with the expansion pack, I have been unable to activate the overhead electrical panel using either the FS menu bar or the icon on the instrument panel.All other facets of the DC3 work fine. It is just this one problem. The aircraft is loaded in FSX with Windows 7. As of this date I have not used the MAAM DC3 in FSX as I have a previous download of the same a/c in FS9 on another machine. Howevwer is there a fix for this problem or am I having some finger trouble that I am not aware of?Really appreciate the help! It is a really great airplane!CAL2024