# Behavior development help needed

**URL:** <https://forum.kirupa.com/t/behavior-development-help-needed/294879>\
**Category:** programming\
**Created:** [August 21, 2009, 10:31am UTC](https://forum.kirupa.com/t/behavior-development-help-needed/294879 "2009-08-21T10:31:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ETOSoft](https://avatars.discourse-cdn.com/v4/letter/e/e19adc/32.png) [@ETOSoft](https://forum.kirupa.com/u/ETOSoft)\
**Post date:** [August 21, 2009, 10:31am UTC](https://forum.kirupa.com/t/behavior-development-help-needed/294879/1 "2009-08-21T10:31:43Z")

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Hi forum members,

after reading the illuminating posts regarding Behaviors I’ve decided to add a new one to my first WPF Application developed in Blend(visualbasic).

If I declare the “Time” parameter like following, the interface shows me a field where I can input every kind of value, negative positive without any limit (example, the blend par of other behaviors has a range 1-100).

Public Property Time() As Double  
Get  
Return \_time.TotalSeconds  
End Get  
Set(ByVal value As double)  
\_time = TimeSpan.FromSeconds(value)  
End Set  
End Property

Could you suggest me the way to add a parameter that accepts only a range of values (for exemple from 1 to 100)?