I recall being told I would have access to source code once I buy a licence.

Now that I have a licence, how do I get access to the source so I can do a local build?

When there are so many rows that the browser has a scroll bar, the context menu that opens automatically moves the scroll bar to the lowest position. 

Pictures attached showing the problem.

Also example code attached.

I have a TelerikGrid inside of a Blazor component (this blazor component sits within a Telerik tab control which in turn sits on a Blazor page).  The last column in the grid is a button that pops up a context menu for that selected row.

The context menu code in the component looks like this:

<TelerikContextMenu @ref="@ContextMenuRef" Data="@MenuItems" OnClick="@((TelerikGridContextMenuItem item) => OnContextMenuItemClick(item))"></TelerikContextMenu>

The code for the last grid column looks like this:

<GridColumn Width="60px" Filterable="false" Groupable="false" Reorderable="false" Locked="true">
    <Template>
        <span @onclick:stopPropagation="true">
            <TelerikButton Primary="true" OnClick="@((MouseEventArgs e) => ShowContextMenuOptionsForRow(e, context as TyreCatalogueInfo))" Icon="more-vertical"></TelerikButton>
        </span>
    </Template>
</GridColumn>

The MenuItems for the context menu are set in the OnInitializedAsync method for the component like this:

protected override async Task OnInitializedAsync()
{
    if (IsEnvironmentSet())
    {
        MenuItems = new List<TelerikGridContextMenuItem>
        {
            new() {Text = "Edit Tyre", Icon = "edit", Action = EditSelectedTyre}
        };

        await base.OnInitializedAsync();
    }
}

When any of the buttons in the last grid column are clicked this invokes the ShowContextMenuOptionsForRow which is on a base class which the Blazor component inherits from.

The code for that looks like this:

protected async Task ShowContextMenuOptionsForRow(MouseEventArgs e, TRowInfoType row)
{
    SelectedRowInfo = row;

    await ContextMenuRef.ShowAsync(e.ClientX, e.ClientY);
}

If I stick a breakpoint on the first line SelectedRowInfo = row; within the ShowContextMenuOptionsForRow method it pretty much immediately hits.  If I then hit F5 to continue it takes a further x seconds for the popup menu to appear.  I'm not sure where the time is being spent/lost.

See supporting video which demonstrates the slowness.

https://drive.google.com/file/d/1My5gpDx9qPRi2Fz4tpab7LEWGQZDG3eY/view

I have used this same pattern for other pages (pages that have the grid directly on it, with no other child Blazor components involved) and the speed of the popup is instantaneous.

UPDATE

The slow performance seems to be linked to the Blazor ShouldRender property which is defaulted to true in the Blazor framework.  If I override the ShouldRender property by setting private member field _shouldRender to false when the context menu is invoked by the user, then it appears on screen instantly.  I can reset the private member field _shouldRender back to true when the user click on one of the context menu items.  The issue I have is that once the context menu is invoked by the user they could click anywhere else on the page to dismiss the context menu and that would leave the private member field _shouldRender  as false and have a negative effect on other interactions that need the ShouldRender property to return true.

The code I originally posted I have updated as follows:

private bool _shouldRender = true;
protected override bool ShouldRender()
{
    return _shouldRender;
}

protected async Task ShowContextMenuOptionsForRow(MouseEventArgs e, TRowInfoType row)
{
    _shouldRender = false;

    SelectedRowInfo = row;

    await ContextMenuRef.ShowAsync(e.ClientX, e.ClientY);
}

protected async Task OnContextMenuItemClick(TelerikGridContextMenuItem item)
{
    _shouldRender = true;

    if (item.Action != null)
    {
        await InvokeAsync(item.Action);
    }
}