created an attachment (id=158670)
screenshot

description:
only the value series selected is shown in context menu and others are disabled.

build number:
2.5.2.v20100210-0630

steps to reproduce:
1. new a data source and a data set.
2. new a chart, binding to the data set, add one series.
3. select one column and invoke the context menu, check the sub menu of "plot as value (y) series".

expected result:
all the series are enabled.

actual result:
only the series selected is enabled.

error log:
n/a
fixed. when the series is not selected, the expression button from manager will be null. so update it directly by query. also fixed some control color refreshing bugs.
verified in build (2.6.0.v20100315-0630).
verified in build (2.5.2.v20100316-0202), closed.