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I'm new to TWL, and i cant find information about what i need... I want to create a resizable frame (user could resize it by draging its edge) in the lwjgl window, and i want to display the openGL viewport in that frame. How can i actualy do that?

This one is not relative to the topic, but: How can i check if mouse is over the twls Button?

a) override paintWidget() and carefully put your rendering code in there - best to use LWJGLRenderer.pauseRendering() and resumeRendering(). You will need to setup the view port based on the position & size of the widget. You can take a look at the TWL Theme Editor - it does this to render the preview in the bottom center.

b) a button will set the "hover" animation state while the mouse is over it

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TWL - The Themable Widget Library

a) Could you plese clarify the anwser? How can overriding a paintWidget method with the rendering code put the view port into the resizable frame? I dont even think that method is somehow related to the ResizableFrame class.

b) I wanted to ask how can i check if the mouse is over the button!

P.S
Please write no more anwsers like "bananas are yellow" when i ask you "how can i change the color of bannanas"... I'm not trying to make you feel bad, i'm just really pissed, because the documentation of TWL is awful, just like your anwser.

Well - if you don't like my answers then you are out of luck. If you want more precise answers you should ask precise questions and not vague ones like "i want to display the openGL viewport in that frame".

a) every widget has a paintWidget() method. LWJGLRenderer always keeps the same OpenGL state (which you can see in it's code) - so based on that knowledge you can do your own OpenGL drawing inside that method as long as you reset the GL state - which is mostly what pause/resumeRendering is designed for - it reverts the GL state to that which was active before TWL started rendering.

b) look in the code how the animation state "hover" (or STATE_HOVER in code) is set. Basically every mouse interaction happens in handleEvent(), but this requires that you subclass the Button. The theme will use the "hover" to decide how to render the button while the mouse is over it. And tool tips are displayed by the GUI automatically when a widget has a tool tip.

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TWL - The Themable Widget Library