title: Using Format in a livebindings CustomFormat
body: <p>I'm trying to use LiveBindings to format a number for display in a TEdit on a FireMonkey form.</p>
  
  <p>I'm trying to use the Format method in the CustomFormat of the binding to format the number with two decimal places.</p>
  
  <p>I can 'hard code' the output:</p>
  
  <pre><code>Format("Hello", %s)
  </code></pre>
  
  <p>which is working, but I can't work out what formatting string to use. If I try a standard formatting string such as,</p>
  
  <pre><code>Format("%.2f", %s)
  </code></pre>
  
  <p>I get a runtime error "Format invalid or incompatible with argument".</p>
  
  <p>Indeed I get an error whenever I include a % symbol in the format string, so I'm guessing Format takes a different type of argument, but I can't find any documentation to say what the correct format string is.</p>