Commented Unassigned: IntegerUpDown FormatString Hexadecimal with Prefix [22514]

First, let me say this is a wonderful library, which I have used extensively.

I have several IntegerUpDown controls with "prefixes" in the FormatString:

```
FormatString="'DLC =' 0"
```

I also have a few using hexadecimal format:

```
FormatString="X4"
```

But when I combine the two concepts, everything falls apart and I just get "DLC = X4" in the box:

```
FormatString="'DLC =' X4"
```
Comments: ** Comment from web user: BoucherS **

Hi,

Try with :
```
<xctk:IntegerUpDown Value="6"
FormatString="{}DLC = {0:X4}"
```

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