$ie.visible = $false

Question

I use the following to assign text and search ok if set $ie.visible = $true. But the text cannot be assigned if set $ie.visible = $false. The text box is still empty after run $ie.Document.getElementById('TextBox_ID') = 'This is'.  
Is there a way to fix it? Thank
$ie = New-Object -COM "InternetExplorer.Application"
$ie.visible = $true
$ie.Navigate('http://searchtext.com')
While  ($ie.busy) { Start-Sleep -Seconds 1 }
$ie.Document.getElementById('TextBox_ID') = 'This is'
$ie.Document.getElementById('Search_ID').click()

Answer 1

What is this line supposed to do" "ie.Document.getElementById('TextBox_ID') = 'This is'"
An ID cannot have a space in it.
You cannot directly assign a value in that way.  You need to assign the value member.
A web page that I not vivible can very easily not behave as expected.  It all depends on the design of the web page.
if($tb=$ie.Document.getElementById('TextBox_ID')){
    $tb.Value='This is the new value' 
}else{
    # textbox not found
¯\_(ツ)_/¯