Native Handle of sf::RenderTexture

[Mazzelfassel]

I've currently integrated the ImGui Libary into my SFML eviroment and started to draw my own custom Widgets. So far so good it works fine with normal sf::Textures using the getNativeHandle() function but when I Try to get the Handle of a RenderTexture my Widget just contains white Boxes (like when the sf::Texture got lost).
So my question is, is there any difference between accessing the OpenGL handle of a RenderTexture and the Handle of a regular sf::Texture?
Working example wit sf::Texture

draw_list->AddImage((void*)(texture.getNativeHandle()), rect.Min, rect.Max);

Only white boxes when using sf::RenderTexture

draw_list->AddImage((void*)(getRenderTexture().getNativeHandle()), rect.Min, rect.Max);

[Laurent]

What's the return type of getRenderTexture?

[Mazzelfassel]

const sf::Texture& getRenderTexture() { return(renderTexture.getTexture()); }

Trying to save the Texture of the sf::RenderTexture in a seperate class member results in a nativeHandle of 0

[Mazzelfassel]

Nevermind I've found the bug.  You cant display a RenderTexture if its never drawn, another victim of to early runtime optimisations (there was a flag that skipped the draw Function of the RenderTexture when no logical changes occured).