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GeneralRe: Diagonal text input and presentation in WPF Pin
Member 865720224-Feb-14 9:39
MemberMember 865720224-Feb-14 9:39 
GeneralRe: Diagonal text input and presentation in WPF Pin
SledgeHammer0124-Feb-14 11:53
MemberSledgeHammer0124-Feb-14 11:53 
QuestionTheme Highlighting in XAML Pin
Kevin Marois20-Feb-14 5:09
professionalKevin Marois20-Feb-14 5:09 
QuestionWpf ScrollViewer with non scrollable or partially non scrollable Control Pin
BMicka19-Feb-14 22:06
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QuestionDataTemplate from a StaticResource Pin
Mycroft Holmes18-Feb-14 18:44
professionalMycroft Holmes18-Feb-14 18:44 
Questionremove double line of ListView Pin
Member 1001614013-Feb-14 1:45
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QuestionWPF Design-Time Headaches Pin
GenJerDan10-Feb-14 10:16
MemberGenJerDan10-Feb-14 10:16 
AnswerRe: WPF Design-Time Headaches Pin
Jason Gleim10-Feb-14 10:34
professionalJason Gleim10-Feb-14 10:34 
I usually find this is an issue for two reasons:
- A (dependency) property on a control is not being set in the default or specified style. This usually happens most on custom controls or controls where I have overridden the default template. Specifying a default value for a property in the default style will usually make this one go away.

- A custom control (or extended control) doesn't handle the binding to a null object correctly. If, for example, you have something bound to a property on a view model but that property is a nullable type, in design mode it will probably be null. When the design surface mocks the VM to present a design-time view, the property evals to null and can throw an exception if the control doesn't handle it properly. If it is a control you wrote/overrode, you can fix it by handling a null value bound to the offending DP. Otherwise, add design-time code to provide a valid value for the offending VM property. (If you are using a framework like MVVMLight, IsInDesignMode is part of the VM base class. Otherwise, System.ComponentModel.DesignerProperties.GetIsInDesignMode will tell you.

Beyond this, good luck. Xaml designer exceptions are especially painful to try to decode. It won't make you feel any better but I've even had the design surface crash repeatedly but clear up after a reboot.
GeneralRe: WPF Design-Time Headaches Pin
GenJerDan10-Feb-14 11:10
MemberGenJerDan10-Feb-14 11:10 
GeneralRe: WPF Design-Time Headaches Pin
SledgeHammer0110-Feb-14 12:04
MemberSledgeHammer0110-Feb-14 12:04 
GeneralRe: WPF Design-Time Headaches Pin
GenJerDan11-Feb-14 5:20
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QuestionHitTest Problem Pin
Kevin Marois10-Feb-14 8:18
professionalKevin Marois10-Feb-14 8:18 
AnswerRe: HitTest Problem Pin
Jason Gleim10-Feb-14 9:41
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QuestionLinq-To-SQL DBML Designer Question Pin
Kevin Marois10-Feb-14 7:11
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QuestionMVVM Bound Radio Button Unexpected Behavior Pin
eddieangel7-Feb-14 12:08
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AnswerRe: MVVM Bound Radio Button Unexpected Behavior Pin
Richard Deeming10-Feb-14 2:10
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QuestionHow to get entire column values of a datagrid when datagrid column header check box is checked and bind those values to a datatable? Pin
abhinav12235-Feb-14 18:28
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QuestionHwndHost & C++/CLI problem Pin
Super Lloyd4-Feb-14 3:09
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QuestionXML Treeview NodeChanged event not triggering on attribute edit Pin
wilx2-Feb-14 22:49
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AnswerRe: XML Treeview NodeChanged event not triggering on attribute edit Pin
wilx2-Feb-14 23:09
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QuestionAnother real newbie question - wiring events to handlers not in the code-behind class Pin
Marc Clifton2-Feb-14 10:57
mvaMarc Clifton2-Feb-14 10:57 
AnswerRe: Another real newbie question - wiring events to handlers not in the code-behind class Pin
Pete O'Hanlon2-Feb-14 11:27
mvaPete O'Hanlon2-Feb-14 11:27 
GeneralRe: Another real newbie question - wiring events to handlers not in the code-behind class Pin
Marc Clifton5-Feb-14 15:09
mvaMarc Clifton5-Feb-14 15:09 
GeneralRe: Another real newbie question - wiring events to handlers not in the code-behind class Pin
Pete O'Hanlon5-Feb-14 23:15
mvaPete O'Hanlon5-Feb-14 23:15 
AnswerRe: Another real newbie question - wiring events to handlers not in the code-behind class Pin
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