Questions on UI for WPF Forum

3 answers

243 views

when i set the tabitem foreground to black and i click on an other tab it's foreground becomes white,

how can i stop this behavior?

TabControl

answered on 16 Dec 2009

3 answers

136 views

Check / Uncheck TreeView Dynamically

Hello,

I have a treeview control and want to check the nodes from code dynamically according to the values coming from the database. Below is my xaml

    
            <telerik:RadTabItem.Content> 
        
                  <telerik:RadTreeView Name="TreeViewCategories" SelectionMode="Extended" 
        
                        IsLineEnabled="True" ItemsOptionListType="CheckList" IsOptionElementsEnabled="True" 
        
                        IsRootLinesEnabled="True" IsTriStateMode="True" > 
        
                        <telerik:RadTreeView.ItemTemplate> 
        
                              <HierarchicalDataTemplate ItemsSource="{Binding Path=ChildCategories, Mode=TwoWay}">  
        
                                     <StackPanel>                                          
        
                                            <TextBlock  Text="{Binding Name}" Name="textblockName"></TextBlock> 
        
                                     </StackPanel> 
        
                              </HierarchicalDataTemplate> 
        
                        </telerik:RadTreeView.ItemTemplate> 
        
                  </telerik:RadTreeView> 
        
            </telerik:RadTabItem.Content>

I try your solution at this page
http://www.telerik.com/community/forums/wpf/treeview/how-to-check-uncheck-items-from-code-behind.aspx

But could not resolve it. When i try the method mentioned at the solution it gives an error. The error comes from the if statement
"Object reference not set to an instance of an object". Below is the code.

    
            void ItemContainerGenerator_StatusChanged(object sender, EventArgs e)  
        
                    {  
        
                        if ((sender as RadTreeView).ItemContainerGenerator.Status == System.Windows.Controls.Primitives.GeneratorStatus.ContainersGenerated)  
        
                        {  
        
                            foreach (RadTreeViewItem item in TreeViewCategories.Items)  
        
                            {  
        
                                item.CheckState = System.Windows.Automation.ToggleState.On;  
        
                            }  
        
                        }  
        
                    }

Can you suggest a solution please.

Regards.

TreeView

answered on 16 Dec 2009

2 answers

61 views

Related Tables in Tabs

Hello,

I'd like to know if there exists a way, to show each of related tables while grouping in separate tab of RadTabControl.
I mean that I would like to do the same as in the WPF DataGridView Demo. If you have the Demo , just run it (DataGrid), and you will see that each related table is in TabControl.

Thank you
Wael

GridView

answered on 16 Dec 2009

2 answers

225 views

Seaching for controls in a cell template

Hello everybody.
I have a RadGridView whith three column teo of whic are displayed and edited using cell templates with a radComboBox and a TextBox

The following is the XAML code

<telerik:RadGridView x:Name="radGridDiscounts"  HorizontalAlignment="Left" Height="150" Width ="500" AutoGenerateColumns="False" ShowGroupPanel="False" MultipleSelect="False" ColumnsWidthMode="Fill" ItemsSource="">
    <telerik:RadGridView.Columns>
         <telerik:GridViewDataColumn Header="Descrizione" HeaderTextAlignment="Center" Width="200"
             DataMemberBinding="{Binding Description}" IsReadOnly="True" IsFilterable="False" />
        <telerik:GridViewDataColumn Header="Tipologia sconto" HeaderTextAlignment="Center" Width="120" IsFilterable="False">
            <telerik:GridViewColumn.CellTemplate>
                <DataTemplate>
                    <telerik:RadComboBox x:Name="radComboOperations"
                                                              SelectionChanged="radComboOperations_SelectionChanged   Loaded="radComboOperations_Loaded"
                                                              DisplayMemberPath="Description" SelectedValuePath="Id"/>
                 </DataTemplate>
            </telerik:GridViewColumn.CellTemplate>
      </telerik:GridViewDataColumn>
      <telerik:GridViewDataColumn Header="Valore" HeaderTextAlignment="Center" Width="75" IsFilterable="False" IsSortable="False"
         <telerik:GridViewColumn.CellTemplate>
            <DataTemplate>
                <TextBox x:Name="textBoxValue" TextChanged="textBoxValue_TextChanged" Loaded="textBoxValue_Loaded"/>
            </DataTemplate>
       </telerik:GridViewColumn.CellTemplate>
     </telerik:GridViewDataColumn>
   </telerik:RadGridView.Columns>
</telerik:RadGridView>

So for every record displayed in the radGridView, "radComboOperations" is a radcombobox displayed in one cell template and "textBoxValue" is a textBox of the other cell template.

During the "_Loaded" operations of both controls I initialize properly the values must be displayed.
And there is no problem at all until now.

What do I have to do is to change Text or IsEnabled properties of "textBoxValue" of the corresponding Item ot the radGirdView, when a radComboOperations_SelectionChanged event of "radComboOperations" is raised.

The following is my function for the event

private void radComboOperations_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    RadComboBox comboBox = (RadComboBox)sender;
    if (comboBox!=null)
    {
        MyDTO dto = (MyDTO)comboBox.DataContext;
        MyOperation Operation = (MyOperation)comboBox.SelectedItem;
        if (Operation.Id == Guid.Empty)
        {
             //need help here where
            //I have to disable the textBoxValue of the corresponding item of the radGridView
            //where and how can I find the textBoxValue text box of the cell template??
        }
    }
}

I will thank a lot everyone may help me!!
Bye everybody
Nick

GridView

answered on 16 Dec 2009

4 answers

376 views

ContextMenu with GridView

All,

I am using WPF GridView and want to attach a ContextMenu with the GridView. What I want is that when user right-clicks any row a ContextMenu appears with various options like Edit, Delete etc.

I have added a ContextMenu to the RadGridView.ContextMenu however when I right-click on the row is de-selected and the menu appears.

I want to row to be selected and in the code want to get hold of the object bound to the that row.

I would really appreciate for any help.

Regards,
Tahir

GridView

answered on 16 Dec 2009

1 answer

145 views

WPF Grid Row Duplication

Hello,

I need to duplicate the selected row on the grid 1-N times. The duplicates will appear below the selected row. The grid is bound to a datatable in a dataset. The only way I've figured to do this is:

for (int i = 0; i <number of duplicates>; i++)

{

Datarow dr = datatablename.NewRow();

dr.ItemArray = datatablename.Rows[<position of row in grid to duplicate>].ItemArray;

datatablename.Rows.InsertAt(dr, <position of row in grid to duplicate> + 1);

dr = null;

}

Is this the correct way to duplicate rows?

Thanks

GridView

answered on 16 Dec 2009

1 answer

86 views

NumericUpDown has NullReferenceExpception when hosted in ElementHost

I'm having trouble with the RadNumericUpDown control. I was able to boil it down to the following.

1. Create a Windows Application project
2. Place a Element Host in the default form (Form1)
3. Create a WPF UserControl.
4. Place a RadNumericUpDown control in a UserControl:

    
            <UserControl x:Class="UserControl1" 
        
               xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        
                    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"  
        
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        
                Height="300" Width="300"> 
        
                <Grid> 
        
                    <Grid.RowDefinitions> 
        
                        <RowDefinition Height="Auto"/> 
        
                    </Grid.RowDefinitions> 
        
                    <telerik:RadNumericUpDown Maximum="100" Minimum="0" IsInteger="True"/> 
        
                </Grid> 
        
            </UserControl>

5. Place that UserControl in the Element Host
6. Run the program.
7. Attempt to click the up or down button in the RadNumericUpDown control.
8. Watch NullReferenceException occur.

This works fine when run in a native WPF app, but fails when hosted in Winforms.

I've tried this with 2009Q2 and 2009Q3 builds.

I'm currently on the trial for RadControls, and this is pretty much preventing me from completing my evaluation and ultimately purchasing the product.

NumericUpDown

answered on 15 Dec 2009

1 answer

150 views

TODAY Button in DateTimePicker?

Hello,
is there a "today" Button in the DTPicker, which selects the current date?

Best regards,
Markus

DatePicker

answered on 15 Dec 2009

3 answers

291 views

Display edit control on row mouseover

Hi,

I wanted to know if it is possible to display edit controls only when the mouse is over the row.

I mean by that that if there is a combobox in a cell, the combobox is not visible as long as i am not overing the mouse on a row. Instead of the combobox, we should see the text only. This allow to have a clean datagrid not clustered with tons of controls and, be able to edit easily with the mouse.

Thank you!

GridView

answered on 15 Dec 2009

2 answers

58 views

Sorting by selection status via an additional column

I have a column with a checkbox in it which will reflect the selection status of the row. This column is added via the xmal and the other columns are binding to the data source.

Same implementation as the following link:

http://www.telerik.com/community/forums/wpf/gridview/button-and-checkbox-on-row.aspx

They work very well and only one issue for me. I can sort other columns by default, but nothing happen when I click the header of the checkbox column, neither the colour will change when I move the mouse over it like other columns.

Is it possible to sort the grid be selection status of the rows (true or false) when I click the header of this column, just like a REAL data column?

Many thanks!

John

GridView

answered on 14 Dec 2009