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Asked: 2026-05-11T12:40:01+00:00

Does anybody know of the reason why could not create instance of UserControl error

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Does anybody know of the reason why ”could not create instance of UserControl” error can occur. It seems to me that it occurs completely spontanous, for example after I add space after node or change tabulation. Maybe it’s some kind of VS bug?

Here are controls. This configuration actually raises an error

<UserControl x:Class='ShortcutsPrototype.KeyboardShortcutsTreePanel'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:ShortcutsPrototype='clr-namespace:ShortcutsPrototype'>       <Grid Margin='3,3,3,3'>         <Grid.ColumnDefinitions>             <ColumnDefinition />             <ColumnDefinition Width='80' />         </Grid.ColumnDefinitions>         <Grid.RowDefinitions>             <RowDefinition />             <RowDefinition Height='30' />         </Grid.RowDefinitions>           <ShortcutsPrototype:KeyboardShortcutsTreeView />         <Button Grid.Row='1' Margin='3,3,3,3' Grid.Column='1' HorizontalAlignment='Stretch'>Reset</Button>     </Grid> </UserControl>   <UserControl x:Class='ShortcutsPrototype.KeyboardShortcutsTreeView'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:ShortcutsPrototype='clr-namespace:ShortcutsPrototype'     Height='300' Width='300'>      <Grid>         <TreeView>             <TreeViewItem HorizontalContentAlignment='Stretch'>                 <TreeViewItem.Header>                     <ShortcutsPrototype:KeyboardShortcutsTreeViewEntry x:Name='generalTreeViewEntry' Title='General' />                 </TreeViewItem.Header>                  <TreeViewItem HorizontalContentAlignment='Stretch'>                     <TreeViewItem.Header>                         <ShortcutsPrototype:KeyboardShortcutsTreeViewEntry x:Name='generalNewFileTreeViewEntry' Title='New File' ShortcutKey='Ctrl+N'  />                     </TreeViewItem.Header>                 </TreeViewItem>                  <TreeViewItem HorizontalContentAlignment='Stretch'>                     <TreeViewItem.Header>                         <ShortcutsPrototype:KeyboardShortcutsTreeViewEntry x:Name='generalOpenFileTreeViewEntry' Title='Open File' ShortcutKey='Ctrl+O'  />                     </TreeViewItem.Header>                 </TreeViewItem>                  <TreeViewItem HorizontalContentAlignment='Stretch'>                     <TreeViewItem.Header>                         <ShortcutsPrototype:KeyboardShortcutsTreeViewEntry x:Name='generalSaveFileTreeViewEntry' Title='Save File' ShortcutKey='Ctrl+S'  />                     </TreeViewItem.Header>                 </TreeViewItem>                  <TreeViewItem HorizontalContentAlignment='Stretch'>                     <TreeViewItem.Header>                         <ShortcutsPrototype:KeyboardShortcutsTreeViewEntry x:Name='generalSaveAsFileTreeViewEntry' Title='Save File As..' ShortcutKey='Ctrl+Shift+S'  />                     </TreeViewItem.Header>                 </TreeViewItem>              </TreeViewItem>             <TreeViewItem HorizontalContentAlignment='Stretch'>                 <TreeViewItem.Header>                     <ShortcutsPrototype:KeyboardShortcutsTreeViewEntry x:Name='debugerTreeViewEntry' Title='Debuger' />                 </TreeViewItem.Header>             </TreeViewItem>             <TreeViewItem HorizontalContentAlignment='Stretch'>                 <TreeViewItem.Header>                     <ShortcutsPrototype:KeyboardShortcutsTreeViewEntry x:Name='refactoringTreeViewEntry' Title='Refactoring' />                 </TreeViewItem.Header>             </TreeViewItem>         </TreeView>     </Grid> </UserControl>    <UserControl x:Class='ShortcutsPrototype.KeyboardShortcutsTreeViewEntry'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     Height='25'>     <Grid>         <Grid.RowDefinitions>             <RowDefinition  />         </Grid.RowDefinitions>         <Grid.ColumnDefinitions>             <ColumnDefinition />             <ColumnDefinition Width='100' />         </Grid.ColumnDefinitions>         <Label x:Name='titleLabel' Grid.Column='0'></Label>         <Label x:Name='shortcutLabel' Grid.Column='1'></Label>     </Grid> </UserControl>
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1 Answer

  1. Perhaps something in your CodeBehind file is throwing an exception. Have you checked that?

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