title: Using TcxPopUpEdit
body: <p>I have tried using a cxGrid and TcxPopEdit to create a checkedComboBox, and I implemented to check each checkbox in the list and show the checked value in PopupEdit.</p>
  <p>For extending it a bit, I had added a PopupMenu for the GridView.</p>
  <p>Now , there are two buttons say Select all , Clear all on popupmenu, When i rightclick the gridview and say selectall it should check all the checkboxes and when i say clear all it should uncheck all checkboxes.</p>
  <p>Can anyone please suggest me some idea for achieving this?
  By the way we are using Dev Express 5.15(Express QuantumGrid v5.15 etc..) with Borland Delphi 6 as Development IDE.</p>
  <p>I am attaching a screenshot of how my app looks.
  <a href="https://i.stack.imgur.com/4u8yR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4u8yR.png" alt="App ScreenShot" /></a>
  Here is the Source which i implemented for doing this Get the Sample Project from DropBox.
  <a href="https://www.dropbox.com/s/xsvj73kxy28ieup/CxPopupEdit_Sample_CDS.zip?dl=0" rel="nofollow noreferrer">SampleProject</a></p>