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# Frequently Asked Questions
- [Does Textual support images? ](#does-textual-support-images )
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- [How can I fix ImportError cannot import name ComposeResult from textual.app ? ](#how-can-i-fix-importerror-cannot-import-name-composeresult-from-textualapp- )
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- [How do I center a widget in a screen? ](#how-do-i-center-a-widget-in-a-screen )
- [How do I pass arguments to an app? ](#how-do-i-pass-arguments-to-an-app )
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<a name="does-textual-support-images"></a>
## Does Textual support images?
Textual doesn't have built in support for images yet, but it is on the [Roadmap ](https://textual.textualize.io/roadmap/ ).
See also the [rich-pixels ](https://github.com/darrenburns/rich-pixels ) project for a Rich renderable for images that works with Textual.
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<a name="how-can-i-fix-importerror-cannot-import-name-composeresult-from-textualapp-"></a>
## How can I fix ImportError cannot import name ComposeResult from textual.app ?
You likely have an older version of Textual. You can install the latest version by adding the `-U` switch which will force pip to upgrade.
The following should do it:
```
pip install "textual[dev]" -U
```
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<a name="how-do-i-center-a-widget-in-a-screen"></a>
## How do I center a widget in a screen?
To center a widget within a container use
[`align` ](https://textual.textualize.io/styles/align/ ). But remember that
`align` works on the * children * of a container, it isn't something you use
on the child you want centered.
For example, here's an app that shows a `Button` in the middle of a
`Screen` :
``` python
from textual . app import App , ComposeResult
from textual . widgets import Button
class ButtonApp ( App ) :
CSS = """
Screen {
align: center middle;
}
"""
def compose ( self ) - > ComposeResult :
yield Button ( " PUSH ME! " )
if __name__ == " __main__ " :
ButtonApp ( ) . run ( )
```
<a name="how-do-i-pass-arguments-to-an-app"></a>
## How do I pass arguments to an app?
When creating your `App` class, override `__init__` as you would when
inheriting normally. For example:
``` python
from textual . app import App , ComposeResult
from textual . widgets import Static
class Greetings ( App [ None ] ) :
def __init__ ( self , greeting : str = " Hello " , to_greet : str = " World " ) - > None :
self . greeting = greeting
self . to_greet = to_greet
super ( ) . __init__ ( )
def compose ( self ) - > ComposeResult :
yield Static ( f " { self . greeting } , { self . to_greet } " )
```
Then the app can be run, passing in various arguments; for example:
``` python
# Running with default arguments.
Greetings ( ) . run ( )
# Running with a keyword arguyment.
Greetings ( to_greet = " davep " ) . run ( )
# Running with both positional arguments.
Greetings ( " Well hello " , " there " ) . run ( )
```
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