How to add search button to my roku channel

Hello! Have you written the search functionality? A search function? If so, it is as simple as adding a button in your XML file and the BrightScript file, observing the field and adding the function. Like so, in XML:

<children>
  <Button 
      id="searchButton" 
      text = "Search Button"
      showFocusFootprint = "true"
 />
</children>

  Now BrightScript brs file:

sub init()
  m.searchButton = m.top.findNode("searchButton")
  m.searchButton.observeField("buttonSelected","searchFunction")
end sub

function searchFunction()
  //your code and logic
end function

Further reading, Roku docs for button: https://developer.roku.com/en-gb/docs/references/scenegraph/widget-nodes/button.md 

I hope this helps!