Custom button on custom tab is always disabled (ribbon bar) - sharepoint

Question

I found a lot of examples how to add custom tab with custom controls on the ribbon bar. But no one works for me. I got the custom tab, but button is always disabled.
There is my current version of code:
<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<CustomAction
Id="CustomRibbonTab"
Location="CommandUI.Ribbon"
RegistrationId="101"
RegistrationType="List">
<CommandUIExtension>
<CommandUIDefinitions>
<CommandUIDefinition
Location="Ribbon.Tabs._children">
<Tab
Id="Ribbon.CustomTab"
Title="Custom Tab"
Description="Custom Tab !!!"
Sequence="701">
<Scaling
Id="Ribbon.CustomTab.Scaling">
<MaxSize
Id="Ribbon.CustomTab.MaxSize"
GroupId="Ribbon.CustomTab.CustomGroup"
Size="OneLargeTwoMedium"/>
<Scale
Id="Ribbon.CustomTab.Scaling.CustomTabScaling"
GroupId="Ribbon.CustomTab.CustomGroup"
Size="OneLargeTwoMedium" />
</Scaling>
<Groups Id="Ribbon.CustomTab.Groups">
<Group
Id="Ribbon.CustomTab.CustomGroup"
Description="Custom Group!"
Title="Custom Group"
Sequence="62"
Template="Ribbon.Templates.CustomTemplate">
<Controls Id="Ribbon.CustomTab.CustomGroup.Controls">
<Button
Id="Ribbon.CustomTab.CustomGroup.CustomButton"
Command="CustomTab.CustomButtonCommand"
Sequence="115"
Description=""
LabelText="Custom Button"
Image32by32="/_layouts/images/PPEOPLE.GIF"
TemplateAlias="cust1"/>
</Controls>
</Group>
</Groups>
</Tab>
</CommandUIDefinition>
<CommandUIDefinition Location="Ribbon.Templates._children">
<GroupTemplate Id="Ribbon.Templates.CustomTemplate">
<Layout
Title="OneLargeTwoMedium"
LayoutTitle="OneLargeTwoMedium">
<Section Alignment="Top" Type="OneRow">
<Row>
<ControlRef DisplayMode="Large" TemplateAlias="cust1" />
</Row>
</Section>
</Layout>
</GroupTemplate>
</CommandUIDefinition>
</CommandUIDefinitions>
<CommandUIHandlers>
<CommandUIHandler
Command="CustomTab.CustomButtonCommand"
CommandAction="javascript:alert('Hello, world!');"
EnabledScript="javascript:return true;"/>
</CommandUIHandlers>
</CommandUIExtension>
</CustomAction>
</Elements>
I cleaned up the cache. I read about importance of EnabledScripts attribute in the CommandUIHandler. But I always have the same result:
Did anybody have the same issue? Please help!

Answer 1

I checked out a local custom action of mine, and the EnabledScript followed a different pattern:
EnabledScript="javascript:function JustReturnTrue()
{
return true
}
JustReturnTrue();"
If your item is showing up, but always disabled, I bet that's where the problem is.
I think the attribute is optional anyway, if I recall.

Answer 2

I had the same problem, I'm not sure if this is the proper solution, I'm a newbie. I removed the element from feature which scope was set to "Site", added another feature, set the scope to "Web", added my button item in this feature, saved, deployed, enabled the new feature from site features and it worked.