How to disable ArcMap Addin combo boxes to not allow extra text next to them?

Question

I am developing an Addin for ArcMap 10. There are two combo boxes that I use. On several of my users's computers, they get this extra text next to the combo box. It appears it is text from the "Caption" attribute in the Addin xml. I can reset the tool bar but the text comes back after I load any MXD (even new fresh ones with nothing in them). I can not replicate this on my computer, or my co-workers. It only appears on a few users computers in different offices.

I have checked everything they have installed, and found the production tools for 10, but haven't found that causes the problem. They say they have a custom VBA script they use to load some data points, but I can't find any of the VBA code being executed using the VBA editor.

I have also found that in customize mode, I can "Browse for image" and change the image, which makes the text go away, but as soon as I go back to the MXD, this setting is reset. The "Default Style" is checked but greyed out, along with the other options.

Here is my current snipplet of XML for first combo box:

<ComboBox
     id="RSAC_Canopy_Cover.Addin_TargetLayerCombo"
     class="Canopy_Cover.Addin.Combos.TargetLayerCombo"
     message=""
     caption=""
     tip="Target Plot Layer"
     category="Canopy Cover"
     showCaption="false"          
     editable="false"
     sizeString="FFFFFFFFFFFFFFFF"
     itemSizeString="FFFFFFFFFFFFFFFF"/>

Here is a picture of the issue:

Has anyone encoutered this problem? Can I disable this in my code, or even overide this in code some how? Does anyone know the cause of this?

Answer 1

This apparently broke in service pack 2, and I think it is related to "NIM061350 - ICommandItem.Style property does not work in ArcGIS 10.0."

Here is the code that I used to fix the combo boxes in an Addin, place this in the OnUpdate()

UID uid = new UIDClass();
uid.Value = //your ID for the tool
var comboBox = ArcMap.Application.Document.CommandBars.Find(uid);
if (comboBox.Style != esriCommandStyles.esriCommandStyleIconOnly)
{
   comboBox.Style = esriCommandStyleIconOnly;
}