Hi guys,

I want to make ExpressionEditor supports custom operators, and use those operators to replace existing one. For example, I want to use "!=" instead of "<>" for "not equal", and use "&&", "||" accordingly. I read the documentation and know how to customize the nodes in the tree, but how about features related to parsing? How to let the parser know the custom operators we defined?

PS: I'm using the latest WPF controls.

Hi,

I enabled filtering on a radcombobox (see below for the xaml). 

When the combobox gets focus the dropdown opens. Next, when I type some characters in the combobox, the filter works correctly and narrows down the resultset to lets say 2 items. Next  I want to be able to click once on the second item in the filtered dropdownlist and pass it on (i.e. it will be used to highlight it in a radtreeview). What happens now is that the first click will just set selecteditem to the clicked item and show it in the combobox. I need to enter (so a second user input) to pass it on.

Is it possible to directly select and pass on an item from a filtered set of items with just one click? One option I considered is using a previewMouseDown event, which is hit after just one click, but than the top item in the filtered list is passed on as selecteditem, even though I clicked on the second item. 

<telerik:RadComboBox  IsEditable="True"  IsFilteringEnabled="True" IsTextSearchEnabled="True" TextSearchMode="Contains" StaysOpenOnEdit="True" OpenDropDownOnFocus="True" ItemsSource="{Binding Locations}" DisplayMemberPath="Description"    KeyDown="CboSearchLoc_KeyDown>

Thanks,

Maarten

Hi,

Is there a way to implement the bar series as in the image attached? The gradient is not necessary.

Currently I'm styling the same bar series as cluster and the goal is to format the top one so that instead of the bar it display the category

But I'm failing. 

Thanks and regards

I've created a UserControl, PortStatusButton, that contains nothing but a RadButton for which I've modified its standard style to incorporate my own VisualStateGroup with its VisualStates.  Its purpose is to be a multistate button with logic based on the values of several of its properties.  I have written a custom VisualStateManager to process that logic.  I have placed the PortStatusButton into the ItemTemplate of a RadListBox and bound its properties to data in my Model.

The basic method I've used to incorporate my visual states into the button is to create a separate VisualStateGroup and then have my VisualStateManager watch for a call to GoToStateCore for a CommonStates.Normal VisualState.  I then check to see what state my button should be in and then call GoToState to go to my desired state.  This allows me to have the PortStatusButton show my states, but still let the RadButton control the overall functioning of the button.

It's all working quite well, with one exception.  When the PortStatusButton first appears, it fails to display my correct VisualState, but displays the CommonStates.Normal state instead.  I think I know why and I'd like to ask you to verify that I'm correct and suggest what I might do about it.

The mode of failure is that the first time a property gets set in PortStatusButton, the UpdateButtonAppearance method that is called by its OnPropertyChanged handler fails to obtain a reference to the the current state of my VisualStateGroup because it can't find the child Grid of the RadButton that contains the VisualStateManager.  Thus, it never calls GoToState because it doesn't know where to go, and the RadButton first displays in its CommonStates.Normal state.

The data that is feeding the bound PortStatusButton properties is coming from my ViewModel, which is defined as the DataContext in the main Grid that contains the RadListBox, and which loads the source collection in its constructor.  My suspicion is that as each PortStatusButton is instantiated by the RadListBox, the Grid in the RadButton's control template has not yet been instantiated, so it's not yet there to be found.  By the time the user starts clicking on the buttons, the Grid has been instantiated and the PortStatusButtons will function as they should.

Is that correct?

What would you suggest I do to allow the buttons to display my correct state when they first appear?

I have included excerpts from my code below:

First, excerpt from my PortStatusButton xaml:

And an excerpt from my PortStatusButton code behind:

And the custom VisualStateManager:

And an excerpt from the control containing the RadListBox:

Hi,

I've enabled the search panel of a grid, the grid is the only control on a form and I want the initial focus to be in the textbox of the search panel when the user opens the form, how do I go about achieving this?

Thanks.

I'm using RadCartesianChart3d to show a surface.  I've written some background code to intelligently choose the Maximum and Minimum values for my Z axis to be on nice even numbers which exceed the boundaries of the data.  I then bind the LinearAxis3D for Z to these values.

The chart honors my Minimum value.  Unfortunately, it sometimes ignores my Maximum value and chooses its own.  

To be sure I wasn't wasting your time, before I posted this report, I tried to reproduce the problem using the sample application that Martin Ivanov attached in a reply in this other forum thread from just 2 weeks ago.  It's the attachment "WpfApp17"

https://www.telerik.com/forums/dynamic-colorizer-for-surfaceseries3d

What I did was change the Z axis  in the sample to use some arbitrary Minimum and Maximum values:

At first, I could not reproduce the problem.  But then I tried updating the sample to use the very latest version of UI for WPF that I have on my machine.  It is R2 2019 SP1 which was literally released today, June 19, 2019.   

Once I changed the assembly references to use the this new version of UI for WPF, the problem did occur.  When I run the sample app with the changes above, my maximum axis value only shows 700, not 900.  

(I realize the data does not go that high but I still want the chart to show the maximum I give to it.)

That's not all.  It gets even stranger.  If you then change the Maximum value from 900 to 1200, suddenly, it *is* honored.


The forum software does not seem to want to let me attach my modified version of the sample to this thread, even though it's a ZIP file and it's only 350k so you'll need to make the changes on your own version to reproduce this.

We're using MapPolygon on the map, and we allow the user configure the map points, the stroke, the stroke thickness, the fill color and the fill opacity. Want to be able to control the stroke opacity separately from the file opacity. We've found that if the stroke thickness is greater than 1, then the stroke line overlaps the filled area. This results in the effect shown in the attached image mappolygon.png i.e. we see the fill color, the line color and a mix of the two colors where they overlap.

What we'd like to have is a filled polygon where the stroke does not overlap the filled area. Can you suggest a way to achieve this effect?

Hey guys,

I have a RESTful server I've created which stores simple objects with a few fields. I have a WPF project that has a RadGridView. It loads these objects just fine from my server. I've also managed to use both the AddingNewDataItem and RowEditEnded listeners to be able to 1) listen for a user creating a new row, 2) create an object on the server with the user's specified fields and 3) store the newly created object returned from the server (with a unique ID) in an ObservableCollection linked to the GridView.

Here's the problem. If I submit the new object to the server via the AddingNewDataItem listener, I can successfully add it to my ObservableCollection. The way the GridView UI works, however, it immediately brings up a selected row with edit enabled upon hitting insert or clicking on the "insert new row" bar. I have not figured out how to update this UI element with the data from the server. I've tried this many, many different ways, but the UI element that opens remains the same. What I have been able to successfully do is replace that row **after** using the RowEditEnded listener. This kinda works but looks odd as certain fields change after the user is done editing and there's no reason I couldn't just show the unique ID retrieved from the server, for example, **before** editing is complete. I've also tried to use AddingNewDataItem listener to listen for the insert request, create a blank object on the server with a new unique ID, and show that object data in the newly created and displayed selected, editable row in the GridView. I have not figured out a way to do this, however. I am able to successfully create a new object on my server and to add that object to my Observable Collection, but I can't seem to find a way to update the data in the newly added row in the UI before the edit is complete. I feel like I've tried so many different ways of trying to find and replace the incorrect objects in the GridView.Items and GridView.Itemsource collections, but to no avail. 

Surely there's an easy way to do this? Thanks in advance! Let me know if you need more info. I could provide code, but I think this is more of a conceptual issue I need to figure out as I've tried to do this like literally 15 different ways. They all sort of work, but don't let me update the UI when I want to do it, so I suspect I'm missing a method or event handler that is more suited to what I'm trying to do.