Hi there, sorry for the dumb newbie question! I have a Next button that should be disabled until all required inputs are there. The inputs are several text boxes, a date picker, and two checkboxes. Here's the code I'm using: If( IsBlank(txtAccountName.Text) Or IsBlank(txtAccountNum.Text) Or IsBlank(txtDeliverBldg.Text) Or IsBlank(txtVendorName.Text) Or IsBlank(txtVendorPhone.Text) Or IsBlank(txtVendorAddress.Text) Or IsBlank(txtRemarks.Text) Or IsBlank(datDeliverByDate.SelectedDate) Or IsBlank (chkITPurchase.Value And chkNotITPurchase.Value), DisplayMode.Disabled, DisplayMode.Edit) The resulting behavior is that the Next button is disabled until the DeliverByDate is selected, then it's enabled. Can anyone suggest how I would modify the IsBlank line for the two checkboxes to make it wait to enable the button until one of them is selected? Thanks for any assistance!