DXHtml doesn't work inside html form

Hello dears,
I’m trying to use the dxhtml inside the html form, the calender doesn’t appear

    <div id="scheduler_here" class="dhx_cal_container" style='width:100%; height:100%;'>
        <div class="dhx_cal_navline">
            <div class="dhx_cal_prev_button">&nbsp;</div>
            <div class="dhx_cal_next_button">&nbsp;</div>
            <div class="dhx_cal_today_button"></div>
            <div class="dhx_cal_date"></div>
            <div class="dhx_cal_tab" name="day_tab" style="right:204px;"></div>
            <div class="dhx_cal_tab" name="week_tab" style="right:140px;"></div>
            <div class="dhx_cal_tab" name="month_tab" style="right:76px;"></div>
        </div>
        <div class="dhx_cal_header">
        </div>
        <div class="dhx_cal_data">
        </div>
    </div>
</form>

When i remove the form tag, the calender works fine.
please any help?

Most probably you have form with zero width or zero height. Try to change percent based size on scheduler’s container to some fixed size in pixels.