> For the complete documentation index, see [llms.txt](https://groophy.gitbook.io/bhdocs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://groophy.gitbook.io/bhdocs/primary/commands/app.md).
# app
Used to manage the interface of the application.
## The basics
Basicly create one of button.
```
app new comp -> $windowName as Button:
"inner": "mytext",
"Width": "50",
"Height": "50".
;
```
Rule
```
[new]
[comp]
[->]
[$]
[as]
[?()]
[:]
[":"]
```
## Example
```
set $windowName (window):
"Title": "Calc",
"Width": "270",
"Height": "330"
;
app new comp -> $windowName as Button:
"inner": "mytext",
"Width": "50",
"Height": "50".
;
show $windowName;
//Coded with BH Beta 0.5.2
```
{% code title="Output:" %}
```
```
{% endcode %}
