It was hard to title this question. :)

I have a user control that is used to display a list of lookup items in my database and a delete button for each item (Editor User Control below). The delete button has an onClientClick event used to display a confirmation dialog in JavaScript.

On page one, the confirmation pops up and functions correctly. The overall structure is:

• Master Page
  • Page
    • Editor User Control
      • List of items with delete button

On page two, the confirmation pops up but regardless of the answer, the page posts back anyway. The structure of this page is:

• Master Page
  • Page
    • User Control
      • Editor User Control
        • List of items with delete button

For some reason, this makes a difference in how the delete button is rendered.

Page one:

<input type="image" name="ctl00...RequestTypesDataList$ctl01$ctl01" src="Images/Disable.png" alt="Delete" onclick="return ProcessDeleteCommand(1);" />

Page two:

<input type="image" name="ctl00...RequestTypesDataList$ctl07$ctl01" src="Images/Disable.png" alt="Delete" onclick="return ProcessDeleteCommand(2);WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;ctl00$ContentPlaceHolder1$RequestCreator1$RequestTypeEditor1$RequestTypesDataList$ctl07$ctl01&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" />

Does anyone know why page two renders WebForm_DoPostBackWithOptions after my JS check? It's causing the postback regardless of the confirmation choice.