private void OnIssueCategorySelected(object sender, EventArgs e)
{
//Event handler for change in issue category
this.mIssueTypes.Clear();
this.mIssueTypes.Merge(CustomerProxy.GetIssueTypes(this.cboIssueCategory.SelectedValue.ToString()));
this.cboIssueType.SelectedIndex = -1;
OnValidateForm(null, EventArgs.Empty);
}