Vertical scroll bar appearing??

Hi,

I have put 4 custom tiles inside the vertical layout.

<l:VerticalLayout class="sapUiSmallMargin" >

  <CustomTile xmlns="sap.m"

  id="oCustom1" width="20rem" height="35rem">

  <content>

  <HBox xmlns="sap.m" id="id1">

  <vbm:GeoMap id="vbi1" width="150px" height="236px"  initialPosition="72.8258;18.9750;0">

   <vbm:vos>

  <vbm:Spots spots="{oModel1>/Spots}" >

  <vbm:Spot  position="{oModel1>pos}" tooltip="{oModel1>tooltip}"  />

  </vbm:Spots>

    </vbm:vos>

    </vbm:GeoMap>

      </HBox>

  </content>

    </CustomTile>

Like above I have 3 more custom tiles, but in UI only 3 are appearing and vertical scroll bar is also not coming to scroll down.

Can  anyone pls suggest, is it not possible to have vertical scroll for tiles.

Regards,

Chandru.