full code

HEADER

#pragma once


// struct for panels
typedef struct PanelTab
{
    const char *tabName;
    void (*handler)(void);

};

class RightFrameImGuiUI : public Object
{
    URHO3D_OBJECT(RightFrameImGuiUI, Object);

public:
    RightFrameImGuiUI(Context * context);
    virtual ~RightFrameImGuiUI();

    // Show Right Frame
    static bool * ShowRightFrame(void);


protected:
private:
    static bool initialized;
    static PanelTab tabNames[];

    static void ShowSettingsPanel(void);
};


SOURCE

///////////////////////////////////////////////////////


bool RightFrameImGuiUI::initialized= false;

PanelTab RightFrameImGuiUI::tabNames[] = {{"Inspector",RightFrameImGuiUI::ShowSettingsPanel},
                                         {"ViewSettings", RightFrameImGuiUI::ShowSettingsPanel}};

RightFrameImGuiUI::RightFrameImGuiUI(Context * context = g_pApp->GetGameLogic()->GetContext())
    :Object(context)
{
    //ctor
}

bool * RightFrameImGuiUI::ShowRightFrame(void)
{
    // return p_opened;
    bool * p_opened = NULL;

    // create tool bar
    ImGuiWindowFlags window_flags = 0;

    // get windows size
    unsigned int Width = g_pApp->GetGraphics()->GetWidth();
    unsigned int Height = g_pApp->GetGraphics()->GetHeight();

    // set flags
    window_flags |= ImGuiWindowFlags_NoTitleBar;

    // create    window
    ImGui::Begin("RightFrame",  p_opened, ImVec2(200,Height-8-128), 0.5, window_flags  );


    ImGui::End();

    initialized = true;

    // test
    void (*DoPanel)() = (*tabNames[0].handler)();



    return p_opened;
}

void RightFrameImGuiUI::ShowSettingsPanel(void)
{
}