Issue With Ajax Modal Popup

I am having an issue, VWD2013 is adding stuff automatically and I don't know why

<ajx:ModalPopupExtender ID="MpeUploadImage" runat="server" TargetControlID="BtnUploadImage" PopupControlID="PnlUploadImage" OkControlID="BtnUpload" CancelControlID="BtnUploadCancel" BehaviorID="_content_MpeUploadImage" DynamicServicePath=""  />

These items I did not add, when I delete them and save it adds them back in

BehaviorID="_content_MpeUploadImage" DynamicServicePath=""

Another issue,

I commented out the Modal, but says TargetControlId is not valid even though I commented out the Modal