WebCombo button element not displaying after i click it once, after i turn webcombo container style-display from none to block.

Another thing is that text is not showing until i click on the button.

<td style="position: relative;">
<div id="cmbPoduzeceDiv" style=" position: absolute; top: 5px; left: 5px; display:none;">
<iswebcombo:WebCombo ID="cmbPoduzece" runat="server" UseDefaultStyle="true" Width="300px" fancyPopUp="true" DataTextField="<%$GetColumnName:Poduzece%>" DataValueField="podTopStructureId" AllowWildCardSearch="true" >
<LayoutSettings ComboMode="MultipleColumns" AlwaysShowAllRowsOnDropdown="true" ></LayoutSettings>
<Columns>
<iswebcombo:WebComboColumn Bound="true" BaseFieldName="<%$GetColumnName:Poduzece%>" Name="Poduzece" HeaderText="<%$GetString:{%00_Pub_Name2%}%>" Width="300px" />
</Columns>
</iswebcombo:WebCombo>

</div>
<div id="cmbPoduzeceMultiSelectDiv" style=" position: absolute; top: 5px; left: 5px; display:block;">
<iswebcombo:WebCombo ID="cmbPoduzeceMultiSelect" runat="server" UseDefaultStyle="true" Width="300px" fancyPopUp="true" DataTextField="<%$GetColumnName:Poduzece%>" DataValueField="podTopStructureId" >
<LayoutSettings ComboMode="MultipleColumns" TextBoxMode="ReadOnly" AlwaysShowAllRowsOnDropdown="true" ResultBoxHeight="450"></LayoutSettings>
<MultipleSelectionSettings Enabled="true" />
<Columns>
<iswebcombo:WebComboColumn Bound="false" BaseFieldName="<%$GetColumnName:Poduzece%>" Name="Poduzece" HeaderText="<%$GetString:{%00_Pub_Name2%}%>" Width="300px" />
</Columns>
</iswebcombo:WebCombo>

</div>