LazRichView does not display any character.

[krzys58b]

I've built a simple application with form and two components: button, RVStyle and RichView.
After button click, a text should appear in the window of RichView, but it doesn't.
The text appears when I put RichView.AddText(text) command in Form.Create event.
But it's all what can be done. Button doesn't work.
Current OS is Win10.
The same application run in the same Lazarus IDE (4) on Win7 works good.
Have anyone any suggestions?

[CM630]

Can you post a snippet illustrating the issue?