The following is what worked for me in version 2023.2.718

var parsedOptions = JSON.parse(options);
parsedOptions.toolbar = kendo.template($("#toolbarTemplate").html());;           
grid.setOptions(parsedOptions);

 

Just inside the toolbar template you can wrap your content in another div element to ensure styling is the same as the original, as in Brandons example some odd styling is being added.

 @helper ToolbarTemplate()
        {
            <div class="k-toolbar k-grid-toolbar k-toolbar-resizable k-toolbar-md" style="width:100%" >

....
}

I was on the phone with support and they mentioned this and they voted for me.  I want to add a different spin to this.  In my opinion I do not need to request the feature that the toolbar is serialized as a part of getOptions.  Rather I think setOptions needs to be fixed to not overwrite things that are not intended on being serialized.  The problem might be that for the toolbar it is sometimes supported and sometimes not....this I'm not sure.  If the grid knew the toolbar shouldn't be updated when setOptions is called you can use a similar approve to one in another comment to ensure it isn't.  You simply get the stored options and before you call setOptions you do the following:

options.toolbar = [{
    template: kendo.template($(transfersGrid.element).find(".k-grid-toolbar").html())
}];

 

In this example transfersGrid is a variable in which I set using jquery and the .data method to get the grid object.  I have it referenced for other reasons but you could use jquery to just go straight to the element.  Either way this gets the existing toolbar (defined currently on the server in my case) and puts in the options so the options never touch the toolbar. In my case the toolbar definition is not part of the state therefore I wouldn't want it saved anyways.

So does that mean there is no way to generalize this?  I have a general savegrid that saves everything about the grid.  It used to work, but not it loses the toolbar which basically makes it useless unless i re-write every instance in which case i will have more code to keep synchronized when a change to the grid is made.