Hello, I need to transfer itools windows to Visual Studio, however when I try to do it, it crashes instantly. I have also tried Tri-window example on IDL website http://www.exelisvis.de/d...omexportexample.html . idlgrwindowexample and idlitdirectwindowexample classes work without a problem and I can use them from VS side. However idlitwindowexample(which in my case I need to use, because this example is about transfering itools windows to VS) does not work, in task manager I see that IDL_Isurface gives no response. I have also modified this class to see if ivolume or other itools work, and I saw that they also cause the same error. In addition, I have tried it on both X86 and X64 platforms, and the result is the same as I have written above. If there are some people on forums who worked with itools-activeX, could they please help me? I use: Visual Studio 2010, SPK 1 IDL 8.2.3 Windows 7 Ultimate X64 16GB RAM i7-2600 CPU @3.40GHz Thanks in advance! Best Regards, Görkem