Hi Farshad, We want to use unigui for our projects. But up to my test case, Inheritence of forms is not work, I'll get the following error Error creating form: Access violation at address 506FA8F9 in module 'vcl210.bpl'. Read of address 0000004B. Let me explain it with any example; 1)I've create one form from TUniForm, I'll give BaseMenu as name 2)I've inherited BaseData from BaseMenu 3)I've inherited BaseGrid from BaseData, I'll get the above error. I've used Delphi XE7.