Nested Forms
已回答
Hello!
I've made a custom GUI Component (just a combination of label, slider and textfield, "LabeledTextFieldWithSlider").
Added it to my palette and made a simple GUI Form like that on the picture.
The issue is I can't edit these label, slider and textfield's properties directly from Intellij Idea's UI Designer.
I've tried to work around with Client Properties but it's not exactly what I want.
Could anyone help me with that?
Thank you!

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Does your component have getter and setter for the label?
Not really, is this the reason?
I've added getters and setters, nothing changed..
I did some research and it appears that Client Properties is the way to go, however, you can't add your own custom components to the tree in the configuration dialog:
IDE is looking into its own classpath for a class, not in the project classpath.
This subsystem is really old, last changes were in 2006.
If you need this feature, I can open a request so that it's fixed for the future updates.
Wow, that would be great for future, I think :)
Thank you for your response!
Request added, please follow https://youtrack.jetbrains.com/issue/IDEA-172090 for updates.