FNCGrid and WebCore using HTML Template

Hi
I get difficulties to integrate FNCGrid in web HTML template with WebCore
As there isn't any ElementID to bind, I tried with a WebDiv and or WebPanel as parent for FNCGrid (with align = client), but if WebDiv or Panel are right placed in generated HTML page, the FNC Grid is "out of panel" despite html code place it is webpanel (in bottom of page with couple of pixel height)

Is there a way to force position of FNCGrid inside a webcore component (Div, Panel or similar)?

Thanks

Code from HTML with wrong position

justify-content: center; align-items: center; outline: none; -webkit-tap-highlight-color: transparent; background-color: rgb(240, 240, 240); display: flex;" tabindex="-1" role="">
<div>
<span>WebPanel1</span>
<span id="TFormView_Demandes_List_TMSFNCGrid5" zindex="0" tabindex="1" role="" style="color: rgb(0, 0, 0); overflow: hidden; outline: none; top: 502px; left: 88px; width: 835px; height: 13px; position: absolute; box-sizing: border-box; user-select: none; -webkit-tap-highlight-color: transparent; background-color: rgb(255, 255, 255); font-family: Arial; font-style: normal; font-size: 8pt;">
<canvas id="TFormView_Demandes_List_TMSFNCGrid5_Canvas" zindex="0" height="12" width="736" style="position: ignore; height: 13px; width: 818px;"></canvas>
<span id="TFormView_Demandes_List_ScrollBar8" zindex="0" tabindex="1" role="" style="color: rgb(0, 0, 0); outline: none; top: 1px; left: 817px; width: 17px; height: 11px; position: absolute; box-sizing: border-box; user-select: none; -webkit-tap-highlight-color: transparent; font-family: Arial; font-style: normal; font-size: 8pt; overflow-x: hidden;">
<span id="TFormView_Demandes_List_ScrollBarContent9" zindex="0" tabindex="1" role="" style="color: rgb(0, 0, 0); overflow: hidden; outline: none; top: 0px; left: 0px; width: 17px; height: 108px; position: absolute; box-sizing: border-box; user-select: none; -webkit-tap-highlight-color: transparent; font-family: Arial; font-style: normal; font-size: 8pt;">
</span>
</span>
</span>
</div>
</span>

That HTML looks incomplete.
We created a test project here and this works as expected here:
Project2.zip (6.1 KB)

Please use a setup similar to this test project.