Facing some issues with ListBox

Hi Guys,

I am facing an issue with ActiveX ListBox which is incorporated in an Excel Sheet. I have given the input as a range (January to December) with multi-selection option. The selection of checkboxes is working fine when working on the sheet. However, on opening of the Excel at the beginning, the ListBox is not allowing to select any values, the mosue pointer is not allwoing to select the checkboxes . Could anyone suggest how to solve this issue?

Thanks.
Pradeep.