player addEventHandler ["InventoryOpened", {
    0 spawn {
        waitUntil {!isNull findDisplay 602};
        with uiNamespace do {
            button1 = (findDisplay 602) ctrlCreate ["RscButton", -1];
            button1 ctrlSetPosition  [0.432969 * safezoneW + safezoneX,0.874 * safezoneH + safezoneY,0.12375 * safezoneW,0.033 * safezoneH];
            button1 ctrlCommit 0;
            button1 ctrlSetText "button";
        };
    };

}];