Dear All, I have been using AutoIt for quite a few projects successfully. But I now got stuck with ThunderRT6 controls in HEC-RAS software. The thing is like this, when I click the Open button on the main program, a dialog box pops up letting me choose a prj file to open. The window has 4 major cnotrls: (1) ThunderRT6DriveListBox (2) ThunderRT6DirListBox (3) ThunderRT6ListBox (4) ThunderRT6TextBox Control (1) accepts updown arrows and mouse click Control (2) accepts updown arrow