screen keybindings prevent mrxvt's shortcut

[joydeep]

Hello list,

I am running screen without any .screenrc; just by "screen" without any
option. My X-terminal is mrxvt. I have already configured mrxvt to listen
to shortcut. 

```
Mrxvt.macro.Primary.Alt+Left:   GotoTab -1
Mrxvt.macro.Primary.Alt+Right:  GotoTab +1
` ` `
 
So in a multi-tab mrxvt, tabs can be changed buy Alt+left/right-arrow and
it is working well. But when I start screen the mrxvt shortcuts stop
working. screen is working with "ctrl+a+[key]" combination. What is then
preventing my mrxvt shortcuts ?

Any clue ?

Thanks