xml
<vbox style="padding: 5px;" width="100%" height="100%">
    <button text="SADSADASDADSADS"/>
    <mj text="`sum_(i=1)^n i^3=((n(n+1))/2)^2`" />
    <button text="below"/>
    <mj text="`i^123`"/>

    <grid columns="3">
        <button text="TL" />
        <button text="T" width="100%" />
        <button text="TR" />

        <button text="L" width="100%" height="100%" />
        <mj text="`sum_(i=1)^n i^3=((n(n+1))/2)^2`" />
        <button text="R" width="100%" height="100%" />

        <button text="BL" />
        <button text="B" width="100%" />
        <button text="BR" />
    </grid>
</vbox>