Thanks for your reply. I understood to add a custom plugin to Qt Designer we use QDesignerCustomWidgetInterface. But the problem is I am creating custom Designer Form similar as QtDesigner Form where we drag and drop widgets(PushButton,RadioButton,Vertical Layout etc.) so In my application i am not able to implement Layouts similar as QtDesigner Form as shown in Attached Image below like adding widgets to layout and it should change according to layout.
I Dont know how to proceed.
Attachment 10364